Sources of random and systematic error

Response to the following problem:

Choose a conceptual variable that can be considered to be a trait of interest to you, and (after conducting a literature review) create a 20-item Likert scale to assess it. Administer the scale to at least 20 people. Compute the scale's reliability, and then, using a statistical software program, delete items until the scale's reliability reaches at least .75 or stops increasing.

Consider what sources of random and systematic error might be found in the scale.

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Basic Statistics: Sources of random and systematic error
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